benb writes: "bugzilla.mozilla.org just hit bug 100,000 (cached). This proves its scalability. BugZilla is used to track work on Mozilla. Every change has to have a bug. This includes new features and bugs found by developers/testers during development (bugs that never reached users). We also get a lot of duplicates (which dedicated triagers sort out). So, the number of filed closed bugs cannot be used as criteria of the quality of Mozilla. During usage, BugZilla evolved to a very comfortable web platform for filing/tracking bugs, one that has only very few competition (of which I know). Examples are the emailing and dependency systems. In fact, BugZilla is probably the most important communication medium used in the Mozilla project (apart from the source code itself)."